New Functionality in 4.2a

New Fluid Models For Pressure Acoustics

The Pressure Acoustics interface contains a number of new fluid
models:

Macroscopic empirical porous models: In addition to the
Delany-Bazley model, you can also choose the Miki model or create a
user-defined model.

Thermally conducting fluid model

Thermally conducting and viscous fluid model

Biot equivalents using a porous model

Thermoacoustic-Solid Interaction Interfaces

New multiphysics interfaces for thermoacoustic-solid coupling in the
frequency domain for 2D, 2D axisymmetric, and 3D models. The
Thermoacoustic-Solid Interaction interfaces combine features from the
Thermoacoustics and Solid Mechanics interfaces.

Voigt Notation for Anisotropic Linear Elastic Materials

Voigt notation is available for specification of orthotropic and
anisotropic linear elastic materials in the Elastic Waves and
Poroelastic waves interfaces, and is now used as the default notation.

Backward Compatibility vs. 4.2

The Pressure Acoustics and Transient Pressure Acoustics interfaces
in version 4.2 are now called Pressure Acoustics, Frequency Domain and
Pressure Acoustics, Transient, respectively. The names for other
acoustics interfaces have changed in a similar way.

When creating an orthotropic or anisotropic linear elastic material
in the Elastic Waves or Poroelastic waves interfaces, the default is
now to use Voigt notation. This will cause a model created using an old
Java script to fail. Adjust the Java file so that it explicitly selects
Standard notation instead of Voigt notation when using orthotropic or
anisotropic materials.